臭氧水灭藻效能影响因素及动力学分析

Influence factors and kinetics of higher concentration ozone water on inactivation of algae

针对现有的高级氧化除藻技术存在效率低、二次污染等问题,以小球藻为研究对象,采用自行设计的螺旋切割器制备高浓度臭氧水循环装置进行灭藻试验,探究臭氧水平衡浓度、反应时间、初始藻细胞光密度和初始反应温度对小球藻的灭活效果并进行动力学分析。结果表明:臭氧水平衡浓度9 mg·L^(-1)、初始藻细胞光密度0.4、初始反应温度25℃、反应时间12 min时,灭藻率可高达96.02%。通过对动力学拟合参数的比较,结果表明在臭氧水平衡浓度不低于11 mg·L^(-1)、初始藻细胞光密度不高于0.5、初始反应温度不低于20℃时,适宜使用一级动力学拟合;在臭氧水平衡浓度低于11 mg·L^(-1)、初始藻细胞光密度高于0.5、初始反应温度低于20℃时,更适用二级动力学拟合。

At present,the available advanced oxidation processes for algae removal have problems of low efficiency,secondary pollution,etc.Taking Chlorella as research object,a high concentration ozone water cycle device assisted by a spiral cutter was designed to kill Chlorella.The effects of equilibrium concentration of ozone water,reaction time,initial optical density of algal cells and initial reaction temperature on Chlorella inactivation were investigated and kinetic analysis was conducted.The results show that the algae removal rate of ozone water on Chlorella could be as high as 96.02%when the equilibrium concentration of ozone water was 9 mg·L^(-1),the initial reaction temperature was 25℃,the initial optical density of algal cells was 0.4 and the reaction time was 12 min.By comparing the fitting parameters,the results show that the first-order kinetic fitting was appropriate when the equilibrium concentration of ozone water was not lower than 11 mg·L^(-1),the initial optical density of algal cells was not higher than 0.5,and the initial reaction temperature was not lower than 20℃,and moreover the second-order kinetic fitting was more appropriate when the equilibrium concentration of ozone water was lower than 11 mg·L^(-1),the initial optical density of algal cells was higher than 0.5,and the initial reaction temperature was lower than 20℃.